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Free
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dos.c
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C/C++ Source or Header
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1990-12-08
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2KB
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90 lines
/***************************************************************************
* dos.c: AmigaDOS and Requestor related functions.
*
* Part of...
*
* FREE: Display free space on your disk volumes.
* Author: Daniel Jay Barrett, barrett@cs.jhu.edu.
*
* This program is Freely Distributable. Make all the copies you want
* and give them away. Use this code in any way you like.
***************************************************************************/
#include "free.h"
/* Given a disk volume name, return how much space is on it. The units
* of space are either bytes or blocks, depending on whether the user
* specified the option OPT_BLOCKS or not. */
long GetMem(char *volume)
{
long freeSpace;
struct FileLock *lock;
lock = NULL;
if (lock = (struct FileLock *)Lock(volume, ACCESS_READ))
{
freeSpace = AvailSpace(lock);
UnLock((BPTR)lock);
}
else
freeSpace = NO_DRIVE;
return(freeSpace);
}
/* This function comes from Tom Smythe's "avail()" function.
* Given a lock on a disk, calculate how much space is left on the disk
* and return that value. The value is in bytes, by default; but if the
* user specified the option OPT_BLOCKS on the command-line, it's in
* blocks. */
long AvailSpace(struct FileLock *disk)
{
struct InfoData *info;
long answer = 0L;
info = AllocMem((long)sizeof(struct InfoData), MEMF_PUBLIC);
Info((BPTR)disk, info);
answer = (info->id_NumBlocks - info->id_NumBlocksUsed);
if (!(flags & FLAG_BLOCKS))
answer *= info->id_BytesPerBlock;
FreeMem(info, (long)sizeof(struct InfoData));
return(answer);
}
/* Return the amount of free RAM on the system, broken into CHIP and
* FAST RAM. */
void GetFreeRam(long *chip, long *fast)
{
(*chip) = (*fast) = 0L;
Forbid();
*chip = AvailMem(MEMF_CHIP);
*fast = AvailMem(MEMF_FAST);
Permit();
}
/* Turn off system requestors for this process. */
void DisableRequestors(struct Process **proc, APTR *oldWindowPtr)
{
*proc = (struct Process *)FindTask(NULL);
*oldWindowPtr = (*proc)->pr_WindowPtr;
(*proc)->pr_WindowPtr = (APTR)(-1L);
}
/* Turn on system requestors for this process, after they have been
* turned off by DisableRequestors(), above. */
void EnableRequestors(struct Process *proc, APTR oldWindowPtr)
{
proc->pr_WindowPtr = oldWindowPtr;
}